why Cs is placed before Fr in periodic table?

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why Cs is placed before Fr in periodic table?

2007-04-08 00:17:55 · 4 answers · asked by saeed a 1 in Science & Mathematics ➔ Chemistry

4 answers

In the periodic table, elements are organized by atomic number (or number of protons in the nucleus). Cs has a smaller atomic number than Fr, so therefore Cs comes before Fr on the periodic table.

2007-04-08 00:23:12 · answer #1 · answered by Anonymous · 1⤊ 0⤋

Because Cs has an atomic number of 55 and Fr is 87.

2007-04-08 00:27:18 · answer #2 · answered by Norrie 7 · 1⤊ 0⤋

Cs has a lower atomic number than Fr.

simpler than that.... =p

2007-04-08 00:25:35 · answer #3 · answered by Vidya 6 · 1⤊ 0⤋

Because its atomic number is lower than Francium's, its atomic mass is lower than Francium's, and its electron configuration puts it in the correct spot in the Table.

2007-04-08 00:24:46 · answer #4 · answered by TheOnlyBeldin 7 · 1⤊ 0⤋